diff options
| author | Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> | 2020-10-15 19:44:32 +0300 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2020-10-23 16:06:19 +0100 |
| commit | 7c714bd0d561dc5dac76ff2705e3c55104c73f1b (patch) | |
| tree | df2b55d50c52003e57384a12a6168bb836a809b6 /xen/arch/arm/traps.c | |
| parent | b45368e1c8bd471025198b2f16bb279e672f762b (diff) | |
xen/arm: Add mapcache invalidation handling
We need to send mapcache invalidation request to qemu/demu everytime
the page gets removed from a guest.
At the moment, the Arm code doesn't explicitely remove the existing
mapping before inserting the new mapping. Instead, this is done
implicitely by __p2m_set_entry().
So the corresponding flag will be set in __p2m_set_entry() if old entry
is a RAM page *and* the new MFN is different. And the invalidation
request will be sent in do_trap_hypercall() later on.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
CC: Julien Grall <julien.grall@arm.com>
Message-Id: <1602780274-29141-22-git-send-email-olekstysh@gmail.com>
Diffstat (limited to 'xen/arch/arm/traps.c')
| -rw-r--r-- | xen/arch/arm/traps.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index a8f5fdfeae..9eaa3420ef 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -1442,6 +1442,7 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, register_t *nr, const union hsr hsr) { arm_hypercall_fn_t call = NULL; + struct vcpu *v = current; BUILD_BUG_ON(NR_hypercalls < ARRAY_SIZE(arm_hypercall_table) ); @@ -1458,7 +1459,7 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, register_t *nr, return; } - current->hcall_preempted = false; + v->hcall_preempted = false; perfc_incra(hypercalls, *nr); call = arm_hypercall_table[*nr].fn; @@ -1471,7 +1472,7 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, register_t *nr, HYPERCALL_RESULT_REG(regs) = call(HYPERCALL_ARGS(regs)); #ifndef NDEBUG - if ( !current->hcall_preempted ) + if ( !v->hcall_preempted ) { /* Deliberately corrupt parameter regs used by this hypercall. */ switch ( arm_hypercall_table[*nr].nr_args ) { @@ -1488,8 +1489,14 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, register_t *nr, #endif /* Ensure the hypercall trap instruction is re-executed. */ - if ( current->hcall_preempted ) + if ( v->hcall_preempted ) regs->pc -= 4; /* re-execute 'hvc #XEN_HYPERCALL_TAG' */ + +#ifdef CONFIG_IOREQ_SERVER + if ( unlikely(v->domain->qemu_mapcache_invalidate) && + test_and_clear_bool(v->domain->qemu_mapcache_invalidate) ) + send_invalidate_ioreq(); +#endif } void arch_hypercall_tasklet_result(struct vcpu *v, long res) |